I decided to do some research to further inform my position, and wow, the Skyway is in a worse state than I thought. In 2018, it cost 12 USD per rider, which is 5.54/12.1 times the cost per rider of Lymmo/Metromover. Sadly, there is not any more recent data, but it wouldn't be good anyways b/c COVID affected the 2019/2020 fiscal year. I expect the Flyer routes increased ridership somewhat after 2018, and that the closure of the Jefferson and Convention Center station during all of 2018 decreased ridership. I'd assume the actual Skyway cost per rider is about 8.6 based on an annual ridership of 1.2 million. That's 3.87/8.47 times the cost per rider of Lymmo/Metromover. Honestly, the system has actually been in an upwards direction in the past decade.
Back on topic, the Brooklyn station would need at least 66 daily riders to match the rest of the line, which is a 100% achievable target IMO (assuming no Weekend service). That's only 33 two-way trips. If it has any more than 66 daily riders, it will decrease the cost per rider of the total system, which I assume will be a given based on the number of residential units and restaurants within 1/4 mile.
I wish JTA had more detailed ridership numbers and technical data in general. Station by station ingress/egress would be appreciated.